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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e296ecefce8934e992c2c368ed88bf243adf45eecf83a2e5f97a46237a499d' 
  AND token = 'Gx4E0J0J47wFuzQtjQESZT4fsX5NDrzQk3mMjElXBeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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