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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46f2751c5744a2b8f76da9200fcf5c466f42f9a849b4591b21831743d5fa8cb' 
  AND token = 'Ni6rXfIZnhCo7IVI/pQ7VnZWKotimfIbk8J3DCKGA7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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