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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894f5f50442f824a15b149dd9dd9094c3cdc9c5352f1c683a4752ebd789d8a7f' 
  AND token = 'unB76l9aU4BFKU8+UpKEW2wkGwPAzzms0K/KVKKaNMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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