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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '490ee8c135ca9fecd298dd6c262fc5a53a0cb7dac54849183bc59b77aff962fa' 
  AND token = '40YR2YBQR9A8hbAvsvtK6/t3VYhUtpX6cNbYb/FDWkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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