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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e893f59e5cfaf390e498e90b505de60d6c0636bafb0756857b43cbc7b13f42d3' 
  AND token = 'MOwcPxr8c1kYUtL8jRMBio9VXkvXwPzzSWjLGUl3X6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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