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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796d5cd793f31c940db41887086aa1f8d6c31e6fe001c313aac24d064d05896d' 
  AND token = 'ayjagC4MhNP8eMbwmsHMrT0Ch7lCXoWMO12PemFj3lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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