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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be18c70f2a3f100587e269724ac91228a85eb1d63897a6deef1f52ca69a90cb3' 
  AND token = 'nRkE7OmP4DZErcir0Mu/x5KpPZRu0QChA4/Rh2p8aX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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