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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5814988e4e6d06d4cf8c0883bad3775a3c5aa2ac39652af79f0b4bfed6d5c55' 
  AND token = 'dtB7tyGJ3ui6XYVeJS9MFF0QqrTZOKfeJ4Hovd4oynA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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