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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9e1e2c05447e10cfab22ef70835e866e0d879c7a4c9c4d580927ee7a0a41cd' 
  AND token = 'D9taBR0w99zeSWoNrs8vzzBmr2l8Eyf36W+zPPcvaBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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