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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc640e2f8ccd8a2b4f2ef1d3f6a99b3aa5283ed49e848462523daddd24ef7c6' 
  AND token = 'R6x3ooxSGq02JkVVTmsrCQIsEpopVYk9zfHkyRja0LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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