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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652469112ba2e85f9fcd4625a0013f9bfff4ea340154b07e6bd3af2e2f72c6f0' 
  AND token = 'pY4toUL0aPakZlK4/8QcSthL6aRfh3+BsiXVbrGVQxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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