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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd075573eec742b90054456832f5ac9c11eecab715a62047ae5f63192fb583a91' 
  AND token = 'l1eVTrRFy7aqUrG1TsUZmBguHqdBHkRy2lEjh9F7QE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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