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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db872eaeedddcbc212ead1a6a8e322a14c914e399d1863839d910092d4ab918' 
  AND token = 'IJOhfbxVkyM2mqMJB9DnHRHDk1J0jVHOXoU0f9Zy+qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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