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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84499dc6eab06fd2e9474daa37c3393f0fe7abf49fd1b50c840caca33b39d3d6' 
  AND token = 'kgRc94VHZH2q9OhHTbx7zETJYs1fZEpAOg9P5pjtfA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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