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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5ba96bac74baeeed7f4c9b9bf3589ffc094e9aedff2f3aecafac3a410b39c2' 
  AND token = 'AQeamhc7lR+gX+JC4+jt87BElNmsldv8exEcTAhLMdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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