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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd237e4b752f27b8b0cdf5970d9f9a16c62827768744d7467a35014449d715988' 
  AND token = '4tdMaIi2FnMnLPjtGPIdYDSz/iyxCnVdtRNCyGvhO6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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