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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9029ef5082e917e171e5b476af7070e0e5883092ece7bf12bf39989cd8ebf8' 
  AND token = 'a8q00ukFDPET6GLiUXWFO2BFftHDm7VYnGMMKubhnUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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