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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034ffc1e101557bd9bbfa20bfe276e16f521557157fd08210f2d9390a33c3473' 
  AND token = '2p7O3iAAnerVqo/xUURPbHRhpsJWkY21ZmPepar/fGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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