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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efebc59a6ff075ff5c98f151af5dc312de71239d86454f789cbfd8103075bbb3' 
  AND token = 'AUfdN8M+jR4nZS8EbSdXJ1ndFH74dapTJJVZNyMBBdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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