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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e444bb6388baf0219f7484b3744dfd18a78cd90e65c7c08f35d77ab2bcfd9e' 
  AND token = 'ejbGGlMil96jtt696dxRDkhgIaecSQtFxGur23SRPZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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