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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46eb09f3e88f53465bac91596ab2af3cb6a9053957fb52de98de5c466791ec85' 
  AND token = '9R+mh0HbDbWbBbfkkGSzm4JVMdZRMFs+2G7vdWFTcWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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