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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ba2a3fe9042457bf1f52c24b5ccfd0ce696f4039ef60928dda12eaf6254356' 
  AND token = '0p0OSvLt1/19fTp1Z9G/9KRTitiMJos3d8vhuaCFFJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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