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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c363f1b12aa607da4a33139878fa55a7af08464d50c9e523b58815f8273e09d8' 
  AND token = 'AaEj+hkzWtf9sczcKHbjm8Qn/5zWJq8631BfyPiUAH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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