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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c3dfe85817a9ea996b1aef530d56fd3202633da1f690369da7d656cc4494b4e' 
  AND token = 'kx/30p0FOKmESH8X5/u29ENoawpkMui/HspcAmGl74Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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