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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f200124c8b1f20c9069f51c6b1dffa09ec7cfa6584e58f2ad06a353119544f0a' 
  AND token = 'X6zrsVnickYi34wiWFiJLSCt5KHtSFH4JSlq219w+0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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