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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907fc30c32157d80e841d5bf149a345d32645989b0c759fd27d12c3724c8b9c8' 
  AND token = 'DnddsMHY2DsHxEZthXvNVucae0pMAGfolWXtwuV9ZYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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