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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ad6d65ac0179d7390bd36e61e6827909154d51a37161f77e302cd5f377662e' 
  AND token = 'fyV30pr00CCmsutvOX3lvPjA6v8CITq88ge7UBtwyeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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