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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829a19649caa0fae9afbb8c008b9eca3d9af69517515c76f8999d9dfa2fdbdfd' 
  AND token = 'egivP00BOUJhYzT/e0Wr3GkcDw9nqhioHsF3t7c9TBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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