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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafc747bfeec6d244eb8f2629e87442276d0c71204738c7d3c83d7e01b29b7ba' 
  AND token = '2vOCB5sAnjMtMEDimKHikxdWIfMTu0uEEhaMTQ+XEMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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