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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4eb4c7edc57a4c466c05e2978ea9fc6e7c76ed32021d0515e80d5f209c9856' 
  AND token = 'BcFgAGf4rXBL08bgH8CajKrccEjJoNl12FukhHhaXEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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