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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63124808f7d47efc3b009567fb843d646b9e46dabc0827c68be637a73b689ce1' 
  AND token = 'T9MPnue81e3sN5I92h2wkL4vvut4Xi4qJRhSxWYfYyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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