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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2e33cf6f5500397846435d5d08bad8b36861983c80953791e77789c480fee8' 
  AND token = 'hEeuoeccmazPzF8C7I/64w4L2MFTxv6bWbqEFtkNr+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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