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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef689f18e7003c45b7a1d35abe6c117aac839901f295900c5c2d5eb390089b0' 
  AND token = 'SCl4Vz7LiB+SgntUSPMY7TYftw3zKlKjc9M3AdIUm6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}