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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4334d887126a649f871e0bbb80c188e08266241f21240ba0b0d83bfd50045a00' 
  AND token = 'AK4G3ShkyotQ/a8Di8HSK+rhXSmvaqZe4dZjsI4IU+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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