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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb7e3ff4f0324862905b13fca546043aa5e131633b577b81cc42fe9c33612a5' 
  AND token = 'rzB6WL+2A4SN4NjS4FUjJRMNbA2oYTdC3moNHqoqAe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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