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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81aec35d06c06a2f8cf9fb3e47e42e81a6327ccde24484a5a3585db36e77e9cd' 
  AND token = 'cBokpdYUg+geajZBcOcNicGwM1pCfEuyxvPPJV0arkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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