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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb7fc1e1dc6bae7dbbffdc1a1497d5d57d1b13df3f8e8dae5483b9c6a900347' 
  AND token = 'HTtmK9x5BaHMLF9JVYtRSHi7Xbxqgi5TLbeaVA5Wp5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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