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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca2c4dda8cac154b225dc8f4e7dace1497c68b8321425d5535b4f49e4cbcbf5' 
  AND token = 'q61FFUvivgWIJdsIRRDXMiT55gkc/4c0F9wJKqPO4xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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