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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26ebc45220cb6efb8a27ab137626795284cd49742d0bfd107b1e6beeb53ca0d' 
  AND token = 'Scss29HBb/uSOTtDYTDLLMn/Udrj7H6bU8tjZT5d+Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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