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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b442da71d9af1db69d5584066208ee70d43f035800cc9c066b6cbb8ed44724' 
  AND token = 'rqSCMINzE/M2YahSYtcLpNjhjJLvHKH7OMdFeqQfvXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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