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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8500a535501652db7b8edc5954a71548c3f5442457474a488aa119ea6b8064b' 
  AND token = 'aLDftYJ4gg4lAnGEn5DmlULm6NfAclYhs8f/CXvHX44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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