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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debb3b7a97899ff37ca173873ba03f75f9b72a75fc9e2b482b1255aba6e2195e' 
  AND token = '7sVlHjN5EqkwBipsjhaE+g36SMUBgz0PqaS4OL+5RnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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