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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e956e5e2e4c8dbedda672fa88e868980523d546a7d26ac53a7736ede188b6dec' 
  AND token = 'l9gAWo8/Br+VqmCgjbTIDiEypcQu9xUdivWoX3bzjtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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