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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742abbd0e241db9568f894acc6e3570a8578084a47c113232f443a1bb5457aac' 
  AND token = 'db07+MPoulEIBWU2LmfLB8pJELpq12+h7pVVMw/NHuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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