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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c8a895e9d99c73ce202bf8c6bc25a2ec5ba32cbf56710806d7ecac170ee997' 
  AND token = '11JMbCZViJ15ChGABpChVuKjJocxE5JpSQ7Ws92L95k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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