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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed6619eac8ef9bf4e911283f20fd409634edcfe0db6e1b185df6db4286699ad' 
  AND token = 'xUIE+47yUyE9HwTG/jlSrD6qvAPtPIuGQlNrY8ieVcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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