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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1f9b97e8d3fe94d7b1cf58539d8bfd29e6fcc97c1f08d093ce22831ae1e5fb' 
  AND token = 'CvJ4J6uiMoV/+DFnv9Lp9yAoBdXOvRryPZ9sOKi2Xqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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