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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8595df89e913a185d2568900d7f09d4d851a2a5b1bc085f7c6553bca75f227e' 
  AND token = '6edgxeL50Sv1b2PTZy+Hr85LOqtPQzaDeaQgm84xD0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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