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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81cb6242ffe128f7a4988e2ae70a8ad6cd7efcf5a6a876b04fbc05e7e9b8e9e6' 
  AND token = '2rpvvHSf1oaxrvwwvAz6InUTV83iYaFZz8u2ox088B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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