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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89634e3cd96f7ccd7c98ce783b17d9db9d43c2d46f29d53e3d1103f2fa17364a' 
  AND token = 'DCErLok2b4SuckyH0NS/zNU/fVAqdjYhaosRumwJgWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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