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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88c9e82eefbf6eebbee13a13f4ea72d08a7e566a812b774be901b7eb42a361e' 
  AND token = 'rdIisrnB+zF26Cqg7A79TK8cCIkmUB+oALLVxKqCZG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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