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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7886d47543893c30a1e492027c193d5b95f677236ff1d05a7b72a57c59e039' 
  AND token = 'CfmNHBGjeRc2w3pTIBI0BzRTbS/6ltH6FApG4wkwbHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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