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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb459f95ffe9a8a9f319b5f9fb7cfc76c6ff626dd0230c25c028627f711b092' 
  AND token = '3ujFED2UZmjRCmYq6A8KFlMdbMHfa29zGI5jWnXgHX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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