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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93d8c14f1d1a31c39cc3af9f66c397701f8b6f1d366fe9b5976807ab94d668f' 
  AND token = 'zbLmTBUXrZ2vRCdJciTrhpPyPX1MYV3hW5hX0iSFtQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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