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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bed75de190f29adc278f0a0c9ec7410d1c180c21bf37eb589abc35c6d6b9cda' 
  AND token = 'CD6CnypH9k1lrGc2zBqQkQXE0JDo2hGgNUodplSWe6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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