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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc0cc4e2c35a5c465f71188b1c93e80bb1b80b1fc5c27694350c4fa7b75341b' 
  AND token = '7cqbAaMEQwbm1NhSmXJztMsDhJnsB+8x7V1WT/1FsRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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