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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471ce602461b66b824c9570a4622ffa5bf51687ec51186c46df4718872cfd7a4' 
  AND token = 'EWuDdPdFgyjTG8XQPFFrsPk4DF3IbfctSnoXcYFfo50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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