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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f132195e406e49be338ea4d403cf65bc47df9958bc0a055d4f4a2beb1ac1ba' 
  AND token = 'D146n1WCvk7gHMwv1fyBQrml7UMo6tuLD81r5FslG94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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