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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633f7e2bcda5d9ed534fdf87daa0cb2972b79a579a65c49eadfad6a5d0905f27' 
  AND token = 'o5WWPjDYqSp/+OXPa1I0h/ed/VE2t+nrEN90V6D0u3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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