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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e005787158f1ba782a118d7d8244464f23ba776b192383b875cf33af96b19fe' 
  AND token = '0GbO3X2ODhNzTKYr/fcn4gzkc3LKkbZc1Q20htR7xpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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