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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83fe6405d002a522b8e6a9f85dc0356c747c8b4bb110b74f5869e2ad958bbd3' 
  AND token = '05Wsa0S4hKa4mY7Bmey98Py8fpvoPUTeliPD4WadTVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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