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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b932e7c8bdeabcb7ddebac8d21332dd18a18ddf9c6a9d11ffbd70f3c2e7432e8' 
  AND token = 'CxwWhZpeJp7uWOBCsai2Mf2+bPc8PpObZUpeAOz+1Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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