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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b68e559d7d8dd275d0aea753358f725db62da5aa9d14a8346471277d6b1656b' 
  AND token = 'h139G3izC/iTMUEu5JUntMs9hEcXq/eyAAKH6UyF/G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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