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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6812bbb83f46a74c09c50993c747e3898a63895309f91048ab1edcc5c14b656d' 
  AND token = 'T+/QSENNAzvWod5tWX1cQ93NjqzBXQE7mLTXqJ6kazU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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