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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c5d2673ef18c1c2fcabbb0688833b82236ed8131369512e6e0133bca951094' 
  AND token = 'iXKThzMw+h/apEXt4EEZlP8ZrmPLa+5Acbcce0KWoPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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