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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75926442f41f3284000503983ffd7b06213b3effaf16ad14a004baf7a88ebbf' 
  AND token = 'yir7mTMT7iFhJoV7dw0i9Z2RBkd77nD2CPkc9o0RA2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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