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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b512e5ea07f2e4bf7872f21c57e330250587878f5540ecd7a4bc2662ae447d5' 
  AND token = '6U2S6ba5opTP5AFo3Nn0LtyIV8W0hqwwrBvjFI9z2eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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